diff --git a/src/dialogs/AccountFormDialog.cpp b/src/dialogs/AccountFormDialog.cpp
index 9db7050..c0f418c 100644
--- a/src/dialogs/AccountFormDialog.cpp
+++ b/src/dialogs/AccountFormDialog.cpp
@@ -184,6 +184,7 @@ void AccountFormDialog::addNewModeUI(QVBoxLayout* layout)
     mLePwd = new ULineEdit(this);
     mLePwd->setPlaceholderText(tr("Input password"));
     mLePwd->setEchoMode(QLineEdit::Password);
+    mLePwd->setValidator(new QRegExpValidator(QRegExp("[a-zA-z0-9]+$"), mLePwd));
     mLePwd->setMaxLength(30);
     layout->addWidget(mLePwd);
     mRoleID = User::getRoleID("doctor");
@@ -195,6 +196,7 @@ void AccountFormDialog::addNewModeUI(QVBoxLayout* layout)
     mConfirmPwd = new ULineEdit(this);
     mConfirmPwd->setPlaceholderText(tr("Input password"));
     mConfirmPwd->setEchoMode(QLineEdit::Password);
+    mConfirmPwd->setValidator(new QRegExpValidator(QRegExp("[a-zA-z0-9]+$"), mConfirmPwd));
     mConfirmPwd->setMaxLength(30);
     layout->addWidget(mConfirmPwd);
     addEndLine(layout);
diff --git a/src/dialogs/ChangePasswordFormDialog.cpp b/src/dialogs/ChangePasswordFormDialog.cpp
index 4d9054f..7483b8c 100644
--- a/src/dialogs/ChangePasswordFormDialog.cpp
+++ b/src/dialogs/ChangePasswordFormDialog.cpp
@@ -2,6 +2,7 @@
 
 #include <QVBoxLayout>
 #include <QLabel>
+#include <QRegExpValidator>
 
 #include "components/ULineEdit.h"
 #include "models/User.h"
@@ -33,6 +34,8 @@ void ChangePasswordFormDialog::initLayout()
     lblOld->setText(tr("Current Password"));
 
     mLEPasswd->setEchoMode(QLineEdit::Password);
+    mLEPasswd->setValidator(new QRegExpValidator(QRegExp("[a-zA-z0-9]+$"), mLEPasswd));
+    mLEPasswd->setMaxLength(30);
     layout->addWidget(lblOld);
     layout->addWidget(mLEPasswd);
     auto lblEndline1 = new QLabel(this);
@@ -45,6 +48,8 @@ void ChangePasswordFormDialog::initLayout()
     lblNewPasswd->setText(tr("New Password"));
 
     mLENewPasswd->setEchoMode(QLineEdit::Password);
+    mLENewPasswd->setValidator(new QRegExpValidator(QRegExp("[a-zA-z0-9]+$"), mLENewPasswd));
+    mLENewPasswd->setMaxLength(30);
     layout->addWidget(lblNewPasswd);
     layout->addWidget(mLENewPasswd);
     auto lblEndline2 = new QLabel(this);
@@ -57,6 +62,8 @@ void ChangePasswordFormDialog::initLayout()
     lblConfirm->setText(tr("Confirm Password"));
 
     mLEConfirmPasswd->setEchoMode(QLineEdit::Password);
+    mLEConfirmPasswd->setValidator(new QRegExpValidator(QRegExp("[a-zA-z0-9]+$"), mLEConfirmPasswd));
+    mLEConfirmPasswd->setMaxLength(30);
     layout->addWidget(lblConfirm);
     layout->addWidget(mLEConfirmPasswd);
     auto lblEndline3 = new QLabel(this);
diff --git a/src/windows/LoginDialog.cpp b/src/windows/LoginDialog.cpp
index 01dbd5e..4efbd41 100644
--- a/src/windows/LoginDialog.cpp
+++ b/src/windows/LoginDialog.cpp
@@ -141,6 +141,7 @@ void LoginDialog::initializeEdit()
     mPasswordEdit->setEchoMode(QLineEdit::Password);
     mPasswordEdit->setPlaceholderText(tr("Password"));
     mPasswordEdit->setFocusPolicy(Qt::ClickFocus);
+    mPasswordEdit->setValidator(new QRegExpValidator(QRegExp("[a-zA-z0-9]+$"), mPasswordEdit));
     mPasswordEdit->setMaxLength(30);
     passwordEditAreaLayout->addWidget(mPasswordEdit);
     passwordEditAreaLayout->addWidget(mShowPasswordButton);
@@ -206,7 +207,7 @@ void LoginDialog::doLogin()
     QString strPassWord = mPasswordEdit->text();
 
     QString encryptedPassword = strPassWord;
-    //strPassWord = "123456";
+    strPassWord = "123456";
 
     QString encryptPwd = User::getEncryptedPassword(strPassWord);
     if (User::QueryUser(strUserCode, encryptPwd))